Hot air

You know what I've always wondered. How the hell can we blow hot OR cold air out of our mouth? Doesn't it seem weird? I mean it come out of our mouth from our lungs the same way either time right? So how does shaping our mouth different change the temperature of the air coming out? Well I've set out to find the answer and now I can check off yet another thing I don't need to wonder about
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The air is cool because of an effect called cooling on expansion. If we can understand this process, we then know a little about how a refrigerator works in cooling our food. All molecules are held together by attractive forces or weak energies of various strengths. Just as it requires considerable energy or a strong tug to break apart the clasped hands of two people, so it requires a little energy to break apart molecules that are attracted to each other. This must happen because the molecules are close together at slightly higher than atmospheric pressure inside our mouths, but they separate and spread out from each other at lower pressure once they leave the tiny hole in our mouths. From where does this energy come?

The energy comes from the only place it can, from the molecules themselves! However, if a body loses energy, its temperature drops and it gets colder. We experience this especially in our hands and feet on a very cold day. Likewise, when molecules give up energy to break the forces between each other, the molecules drop in temperature, and they get colder. Thus, the air feels colder after leaving through the tiny hole in our lips and expanding into the air around us.

The same principles are at work in a refrigerator. A compressor (which makes much of the noise of a refrigerator) forces a gas (not air) to higher pressure in a small space. The gas is then forced through a tiny hole into a much larger space. The gas expands dramatically and cools considerably, providing the cooling action of the refrigerator. The refrigerator is, of course, much more efficient than we could be with blowing through a tiny hole in our lips.

287 days until retirement. On another note, 83 days until Christmas. Which is almost as good.

Todays RBV: Deuteronomy

17:2 If there be found among you, within any of thy gates which the LORD thy God giveth thee, man or woman, that hath wrought wickedness in the sight of the LORD thy God, in transgressing his covenant,

17:3 And hath gone and served other gods, and worshipped them, either the sun, or moon, or any of the host of heaven, which I have not commanded;
17:4 And it be told thee, and thou hast heard of it, and enquired diligently, and, behold, it be true, and the thing certain, that such abomination is wrought in Israel:
17:5 Then shalt thou bring forth that man or that woman, which have committed that wicked thing, unto thy gates, even that man or that woman, and shalt stone them with stones, till they die.

HERE IT IS FOLKS! My God's penis is bigger than your God's penis. If anyone worships anybody but what I tell you, they must die. Hmmmmm, tell me again why religion is the cause of more deaths than Phillip Morris could ever dream of.